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MINIMODEM(1) General Commands Manual MINIMODEM(1) NAME
minimodem - software audio Bell-type or RTTY FSK modem SYNOPSIS
minimodem --tx [options] {baudmode} minimodem --rx [options] {baudmode} DESCRIPTION
minimodem is a command-line program which generates (or decodes) audio modem tones at any specified baud rate, emulating an old Bell-type or radio-teletype FSK modem. The tones can be played to (or recorded from) the PulseAudio system or to an audio file. minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers using radio, telephone, or another audio communications medium. TX
/RX MODE -t, --tx, --transmit, --write transmit mode: generate audio tones -r, --rx, --receive, --read receive mode: decode audio tones OPTIONS
-a, --auto-carrier automatically detect mark and space frequences from carrier -c, --confidence threshold set receive confidence threshold (0.0 to 1.0, default 0.6) -8, --ascii ASCII 8-N-1 -5, --baudot Baudot 5-N-1.5 -f, --file filename.wav encode or decode an audio file (extension sets audio format) -b, --bandwidth {rx_bandwidth} -M, --mark {mark_freq} -S, --space {space_freq} -T, --txstopbits {m.n} -q, --quiet Do not report CARRIER / NOCARRIER or signal analysis metrics. -V, --version print program version {baudmode} The required {baudmode} parameter may be any floating-point value to specify a baud rate, or the string "rtty". The {baudmode} also implies certain other parameter defaults depending on the rate, including standard (or at least reasonable) default mark and space tone frequencies. 1200 : Bell202 1200 bps --ascii 300 : Bell103 300 bps --ascii rtty : RTTY 45.45 bps --baudot --txstopbits 1.5 {any floating point value N} : Bell-like N bps --ascii EXAMPLES
minimodem --tx 100 Transmit 100 baud tones from one computer ... minimodem --rx 100 and receive 100 baud tones on another nearby computer. minimodem --rx --auto-carrier rtty Decode amateur radio RTTY signals (listen near 14.085 MHz). minimodem --tx 0.5 Experiment with very low baud rates (works in noisy conditions). minimodem --tx 12000 Experiment with very high baud rates works (works with audio files). NOTES
minimodem does not decode AX.25 framed packets. minimodem does not support modem control ("AT") commands, nor does it produce DTMF telephone dialing tones. VERSION
This page documents minimodem version 0.8.1. The latest version is available at <http://www.whence.com/minimodem>. AUTHOR
minimodem was written by Kamal Mostafa <kamal@whence.com>. COPYRIGHT
Copyright (C) 2011 by Kamal Mostafa <kamal@whence.com>. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. July 15, 2011 MINIMODEM(1)
